英语翻译二氧化碳在空气中的含量是385ppm.这里的单位ppm,是“每百万分子数的含量数目”.而水蒸气在地球大气中的含量

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英语翻译
二氧化碳在空气中的含量是385ppm.这里的单位ppm,是“每百万分子数的含量数目”.而水蒸气在地球大气中的含量却高达 1,000-40,000ppm.空气中的水蒸气含量变化很多.在寒冷的两极地区,水蒸气的含量很低；在酷热的赤道地区,水蒸气的含量可能达到 40,000ppm.根据美国宇航局的地球数据表,水蒸气的通常含量是1%,即10,000ppm.
按照这个数值,与二氧化碳的含量相比,水蒸气的通常含量,是二氧化碳的26倍之多.假定水分子与二氧化碳分子的温室效应是等同的.那么单单从分子数目上来看,水蒸气的温室效应就要远远地超过二氧化碳.
事实上,一个水蒸气分子,与一个二氧化碳分子,他们的温室效应效应是不同的.水蒸气的温室效应要远远高于二氧化碳.二氧化碳的唯一显著的吸收频段是在15微米的那个峰值,其他的峰值,因为过于狭窄,吸收的能量很少.水蒸气,从0.8到8微米的多个吸收峰,其中就有两个比二氧化碳的峰宽.从10微米以上,水蒸气的吸收频率几乎是连续不断的,更是与二氧化碳无可比拟.因此,即使在同等浓度下,水蒸气的温室效应也是二氧化碳的很多倍.

1个回答分类：英语 2014-09-20

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Content of carbon dioxide in the air is 385ppm.Here the unit ppm,is "the number of molecules per million the number of levels." The water vapor content in the Earth's atmosphere was as high as 1,000-40,000 ppm.Water vapor content in the air a lot.In the cold polar regions,water vapor content is low; in the hot equatorial regions,water vapor content may reach 40,000 ppm.According to NASA's Earth data tables,water vapor content is usually 1%,or 10,000 ppm.
According to this value,compared with carbon dioxide,water vapor content usually is 26 times as much carbon dioxide.Assume that molecules of water molecules and carbon dioxide greenhouse effect is the same.So just from the point of view the number of molecules,water vapor greenhouse effect will far more than carbon dioxide.
In fact,a water vapor molecule,with a carbon dioxide molecule,and their greenhouse effect is different.Greenhouse effect of water vapor is much higher than carbon dioxide.The only significant carbon dioxide absorption band is that the peak at 15 microns,the other peak,because it is too narrow to absorb very little energy.Water vapor,from 0.8 to 8 microns the number of absorption peaks,of which there are two peak width than carbon dioxide.From 10 microns,the absorption frequency of water vapor is almost continuous,and carbon dioxide is unparalleled.Therefore,even in the same concentration,carbon dioxide,water vapor greenhouse effect is a lot of times.

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